Pulley drum for motor vehicles



June 11, 1935. o. s. KENNEDY 2,004,554

. PULLEY DRUM FOR MOTOR VEHT ICLES Filed Aug. 13, 1934 2 Sheets-Sheet 2Z .3. Q V g Q E Q E Patented June 11, 1935 v UNITED S it it 2,

2,004,554 Y 'PULLEY DRUM FOR MOTOR VEHICLES Donald Stuart Kennedy,Lohgparish, Hampshire,

Eng]

Application August 13, 1934, SeriaLNo.

InGreat' Britain January 1934 5 and 739,689

5.. Claims. (Cl. 180-553).

This invention relates to pulley drums or winches for motor vehicles,andmore particularly to devices ofthe' type in which the drum is'mountedconcentrically with one of the normally driven 5 road wheels and isrotatable by the corresponding axle shaft extendingfrom the differentialgear of" the vehicle; means being provided whereby thenormal road wheelidrivecan'be diverted" to the pulley drum, which enables the latter to"the wheelfremains be; operated by power while stationary uponthe ground.

"e invention has for its'main' objects to pro vide anv improved mountingfor the drum, the'lat' ter being connected" in a positive mannerfito theaxle shaft and having a bea-ringih or 'upon a member to which the roadwheeli is secured;

to provide a detachable connection between'the drumand the road wheel,whichcanreadily be engaged or disengaged as required; and to pro'-- videan arrangement which allows the ready removal and replacementof the roadwheel'in the.

event ofdamage to the wheel or tirep The-invention is hereafterdescribedwith ref erence to the accompanying drawings, in' whichtlshowing examples of the application of my'pulley drum: to drivingaxlesof two different motor vehiclesr Fig. 3 i's a diagram showing the use oftwopulley' thereto-bylongbolts-f with nuts 7 and one or more packingrings g of. suitable shape, sothat thedrum-is rotatable by and with theaxle shaft a, through the mediumeof the driving member b and the'boltsf. The drum e is provided: with inner and outer rims or peripheralflanges e e at its respective sides, and'it is shown so shaped that itcan be used for a rope or cable h;obv iously'the drum can-beso shaped asto lie-adapted of'the drum; through'whichthe bolts are passed,

Figs. land 2 represent part 'sectiona'lelevations usual way; isfittedwitha driving'member 'b'ito" which, in' the n'ormal construction; theroadwheel' c and its brake: drum d are boltedorotherwise secured; thisdriving, member I) is utilized iors e-' curingthe pulley or winding drume, according to the present invention; the drum being connected for usewith a belt or chain in ord'erto convey" thedriveto an adjacent machineof any kind, as already well known in the art. The" body provides a hubor'h'ollow boss ion thevinnerfside, I upon which thereis mounted abearingtmemb'en:

consistingof 'anann'ular flange-plate if ormed' in tegrallywith-acylindrical sleeve'z' rotatable upon: a floating-J bushcjl; to: whichlubricant may be supplied throughsuitable oil-ways (not shown) from areservoir imth'e interioro'f thehub boss; The 5 packing ring 9 heldagainst theinnerfaceofthe boss 7' by the bol-t's serves 'to' retainthebearing sleeve 'i in? position withi'sumcient" axial clearance for.free rotation:

Thero'ad'wheel cisshown asof thedisctype, 10"

l the fiatcentral portion oflthei disc ic which is J normally'b'oltedto'the brake'drum'dand driving member b,1being. bored iout to clear. thepacking. rings or and secured 'loyibolts k-td thezfiange-plate 2' ;i thelatterimtumcan bedetachably connected to the drain; 2" by any:suitable'quickly operated disconnectible device which? breaks the?cOntinuityoffthe drive between the pulleydrume and the: road" wheel Intthe-preferred form this device comprises a plurality of swivelling boltsZ" arrange'diiexternall'y of the" fi'ange pIate i .upon radiali'lugs'lii the swivelfpivo-ts Z? :allowing. the bolts "1' to be: turned: down(as; shown in full lines) so as to" enter radial openeended' slots einxthe innertfiange orrrrim e offthe dru'm;: the nuts 1 upon the boltsi.can thenzhe tightened up to lock the flange-plateandf pulley drumtogether for conveyingxthe drivefrom the drum'zto the flangeplate and-:road wheel? in? ordinary running. The roadiwheel'i's thus r'otatablewith thepulley'drurn, but i when the roadl wheel: i'si' stationary andthe swivelling bolts-J are released from the slotted flange-ct(-asindicate'dzinidottedflines) the pulley" drum 'can' be rotated: by?engine: power through i the transmission and axle shaft, without theroad" wheel-c beinggdrive'n; the bearingtmember i 12 remainingstationary whilethe; drum'e revolves. By reasonvof thedrive taking;place through the ordinary transmissions gear" box, the pulley drum ecan be: rotated atdifferent speeds according to the gear ratiosavailable, andcin either direction as-desired;

If: the: road-1wheel hastobe changed in the course of a journey, it isnecessary also to remove the'pulley drum e=and the flange-plate' 2'.'These parts are Eremovab'le'as a'single unit by disconnection 'ofethefnutsq after j ackingup the wheel, and the unit can then" be: placedwith the drumresting-flat 'onrthe ground and the Wheel uppermost thenutsk! on' the-inner ends of the bolts k are removed, the?wheelliftedoffandreplaced by thespare; and the latter 'secured to theflange-plate bymeans of the nuts k thesunitbeingthen refittedsupon-the' boltsffandisecuredl'by the nuts 7. Byrproviding demountable; rimsiofi'thewellknown kind, it is obviously possible to replace a damaged tire withoutchanging the road wheel itself.

Referring to Fig. 2, the axle shaft a is shown provided with a drivingmember b which is secured by bolts f toan annular or disc-shaped web eof the pulley drum, teeth or dogs m being preferably provided on theabutting faces to transmit the drive to the drum. In thisconstruction/the flangeplate comprises a bearing boss 2' which isrotatable in the' interior of the winding drum, a floating bush 9' beingpreferably interposed; the open center of the boss i is formed with anannular rebatel:.i which engages rotatably between the web e of thepulley drum and a thrust face b upon thedriving member, a loose washeror wearing ring I) being interposed.

The boss 1' of the flange-plateis secured by :bolts n to a flange c'upon the hub c of the road wheel,

which is shown as having twin tiresm ounted.v upon separate rims c 0carried by-ofis'et discs c bolted to thehub The flange-.plateis. de-',;itions where-the removalof .the driving. member.

tachably connectible to the'pulley drum e as. in

the previous case, for example by meansofswivelling bolts Z pivotedupon'rradial lugs 1 on the flange i and engageable with slots intheinner rim e of ,the' drum.

if either of 'thetires haste-be chatgedae.

pulley drum, driving member and flange-plate can be removed from theaxle shaft as asingle :unit by: undoing the nuts, n of the bolts n, the

tire rim or rims 0 0 being then unbolted from the hub .0 after changingthe: tire, the drumv and flange-plate unit is 'thenreplaced upon theaxle shaft and secured by the boltsm; In construc-' b from the axleshaft (1. is not desirable, it may be necessary toundo, the nuts of thebolts -1 so i that the drume c5 can beremovedseparately,

before the flange-plate is detached from the .Where, instead of the twintiresshown inFig. 2, a single tire is employed, mounted .upon'a'rimr chaving its disc 0 -offset for bolting to the'inner end ofthe hub c ,theflange-platei may evident- ;ly' be arranged for the. disc 0 to be bolteddirect to it, substantially asinjthe case of Fig. '1; the

wheel will then be fitted with the offset v.disc c turned outwards so.that the plane of the: .wheel remains approximately thesame as in thestand-1- ard arrangement whereitis: bolted .to; the hub c thiswillenable, the wheel, secured dir'ectly to the flange-plate, to; be removedas 'asingle. unit with the winding drum andfiange-plate, as: in the casepreviously described with reference 'litol figel. The rope or cable-h'operated by the pulley drum may beused for various purposes. Forexample,if the vehicletis held up' by iwheel spin in 'boggyground, cablesanchored totrees or'to another vehicle in front may be1wound round thedrums on'both'sides, so that-the vehicle can draw itself forward; if theroad wheelsare con nected to the drums, bythe bolts Z, then the wheelswill take up the driveas soon as'they obtainjasufficient gripw Similarlythe winding cable can be employed for hauling another vehicle out ofboggy ground, the hauling vehicle being stationary with its .windingdrum or drums disconnected from the correspondingroad wheels.

For-example, Fig. 3-illustrates. the useof'a sixwheeled vehicle V havingtwo driving axles,xthat is with two diiferentialgears and four drivingwheels, for haulage .work of this kind.'- A pulley drum E is fitted toeach of the rear wheels 0 on one side," these fwheels,beingz'disconnected from the drums E so that the vehicle can remainsta-- tionary. The haulage cable H is secured at one end to a fixedpoint, such as a ground anchor O, and passed over a pulley block Pfastened to a second vehicle V which is to be drawn out. The cable thenruns around the two drums E on one side of the hauling vehicle V, andthe free end H is pulled tight by hand; upon transmission of the enginepower to the drums E, the cable H will be wound in, thereby drawing thesecond vehicle forward. It will be noted that by reason of the twodifferential gears provided, both drums f E engagedtbythe" haulage cablecan be rotated while the hauling vehicle V remains stationary, beingheld by suitably'wedging scotches Q or the like. 7

Pulley drumsE can evidently be fitted upon both'ends of the driving axleor axles, the cable -H beingpassed around one drum (or around two drumson the same side of the vehicle) and then taken round the .pulley blockP to a guide sheave at the anchorage 0, from whichit returnsto a secondpulley block on the vehicle V and then back to the, other side of,the'hauling'vehicle v,

where-it is passed over the drum (or drums) on that side"; Thisarrangement not only gives a multiple purchase but also balances theload and overcomes any, tendency for the hauling vehicle Vto slew round,as it does whenonly one drum is in use and a heavy pull is imposed;moreover, so long as the drive remains in balance, the workof thedifferential gear or gears is relieved,,being limited tothe equalizationof the'drive upon thedrums secured to the axle shafts.v

'Whati-I claim is: 1

wheel adapted to be drivenfrom said shaft, a

pulley drum, detachable means for securing said pulley drumftosaidpdriving member, a bearing member rotatable in relation to saidpulley drum, and detachable means for securing said bearing member tosaid. road wheel,'said pulley drum and ,bearing member beingconcentrically mount-, ed in relation to said. shaft and road'wheel, anddetachable driving connections between saidpulley drum andbearingmember, said pulley. drum,- and bearing member being detachable as aunit" byremoval of said securing means betweensaid pulleyjdrum-anddriving member and of said securing means between said'bearing memberand road wheel. 1

2. In a'motor vehicle having an axle shaft, a driving member'secured tosaid shaft, and a road wheel adaptedto be drivenfrom said shaft,

a pulley drum secured to said driving member, a bearing member rotatablein relation to said pulley drum and secured to. said] road 'wheel, saidpulley drum and bearing member being con centrically mountedinrel'atio'n to said shaft; and

road wheel; and driving connections between said pulley 'dru'rn'andbearing member, said *driving v connections consisting of swivellingboltspivotally mounted upon one and engage'able in slots upon the otherof two'parallel flanges, said flanges being integral with said pulleydrum and bearing member. V

3. In a' motor vehicle having an axle shaft,,

a driving member securedto said shaft, and a road wheel adapted to bedriven from said shaft, a pulley drum,-detachable means for securingsaidpulley drum to said driving'member, a bearing. member rotatable inrelation tosaid pulley drum, detachable means for securing saidbear 3L-In amotor vehicle having an axle shaft, a driving member secured tosaidshaft, and a road ing member to said road wheel, said pulley drumand bearing member being detachable as a unit by operation of both saiddetachable means for the purpose of removing the road wheel, anddisconnectible means for driving said road Wheel from said pulley drumthrough said bearing member and said detachable means.

4. In a motor vehicle having an axle shaft, a

driving member secured to said shaft, and aroad wheel adapted to bedriven from said shaft, a pulley drum secured to said driving member, abearing member rotatable in relation to said pulley drum and secured tosaid road wheel, said bearing member including an annular flange and acylindrical boss, said cylindrical boss forming a bearing for saidpulley drum independent of the wheel loading, said pulley drum having aslotted rim flange alongside said annular flange, and disconnectiblemeans for driving said road wheel from said pulley drum, said drivingmeans member rotatable in relation to said pulley drum,

detachable means for securing said bearing member to said road wheel,said pulley drum, bearing member and road Wheel being detachable as aunit by operation of the first-mentioned detachable means, and said roadwheel being removable from the detached unit by operation of thesecond-mentioneddetachable means, and dis-- connectible means'fordriving said road wheel from said pulley drum, through said bearingmember and said second-mentioned detachable means.

DONALD STUART KENNEDY. 20

